www.pudn.com > minix.instalation.cd-rom-2.0.rar > FIPSSPEC.CPP

/*  
	FIPS - the First nondestructive Interactive Partition Splitting program  
  
	Module fipsspec.cpp  
  
	RCS - Header:  
	$Header: c:/daten/fips/source/main/RCS/fipsspec.cpp 1.4 1995/01/19 00:00:53 schaefer Exp schaefer $  
  
	Copyright (C) 1993 Arno Schaefer  
  
	This program is free software; you can redistribute it and/or modify  
	it under the terms of the GNU General Public License as published by  
	the Free Software Foundation; either version 2 of the License, or  
	(at your option) any later version.  
  
	This program is distributed in the hope that it will be useful,  
	but WITHOUT ANY WARRANTY; without even the implied warranty of  
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  
	GNU General Public License for more details.  
  
	You should have received a copy of the GNU General Public License  
	along with this program; if not, write to the Free Software  
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
  
  
	Report problems and direct all questions to:  
  
	schaefer@rbg.informatik.th-darmstadt.de  
*/  
  
#include   
  
#include "fipsspec.h"  
#include "global.h"  
#include "input.h"  
  
#define FIRST_CHECK false  
#define FINAL_CHECK true  
  
#define DISK_INT 0x13  
  
#define RESET_DISK 0  
#define GET_DRIVE_PARAMS 8  
  
void fips_bpb::print (void)  
{  
	printx ("Bytes per sector: %u\n",bytes_per_sector);  
	printx ("Sectors per cluster: %u\n",sectors_per_cluster);  
	printx ("Reserved sectors: %u\n",reserved_sectors);  
	printx ("Number of FATs: %u\n",no_of_fats);  
	printx ("Number of rootdirectory entries: %u\n",no_of_rootdir_entries);  
	printx ("Number of sectors (short): %u\n",no_of_sectors);  
	printx ("Media descriptor byte: %02Xh\n",media_descriptor);  
	printx ("Sectors per FAT: %u\n",sectors_per_fat);  
	printx ("Sectors per track: %u\n",sectors_per_track);  
	printx ("Drive heads: %u\n",drive_heads);  
	printx ("Hidden sectors: %lu\n",hidden_sectors);  
	printx ("Number of sectors (long): %lu\n",no_of_sectors_long);  
	printx ("Physical drive number: %02Xh\n",phys_drive_no);  
	printx ("Signature: %02Xh\n\n",signature);  
}  
  
void fips_partition_table::print (void)  
{  
	printx ("     |        |     Start      |      |      End       | Start  |Number of|\n");  
	printx ("Part.|bootable|Head Cyl. Sector|System|Head Cyl. Sector| Sector |Sectors  |  MB\n");  
	printx ("-----+--------+----------------+------+----------------+--------+---------+----\n");  
	for (int i=0;i<4;i++)  
	{  
		printx ("%u    |    %s |%4u %4u   %4u|   %02Xh|%4u %4u   %4u|%8lu| %8lu|%4lu\n",i+1,  
		partition_info[i].bootable ? "yes" : " no",  
		partition_info[i].start_head,partition_info[i].start_cylinder,partition_info[i].start_sector,  
		partition_info[i].system,partition_info[i].end_head,partition_info[i].end_cylinder,partition_info[i].end_sector,  
		partition_info[i].start_sector_abs,partition_info[i].no_of_sectors_abs,partition_info[i].no_of_sectors_abs / 2048);  
	}  
}  
  
void fips_harddrive::get_geometry (void)  
{  
	union REGS regs;  
  
	regs.h.ah = GET_DRIVE_PARAMS;  
	regs.h.dl = number;  
	int86 (DISK_INT,®s,®s);  
	if (global.debug_mode)  
	{  
		fprintf (global.debugfile,"\nRegisters after call to int 13h 08h (drive %02Xh):\n\n",number);  
		fprintf (global.debugfile,"   00       sc/cl    hd\n");  
		fprintf (global.debugfile,"al ah bl bh cl ch dl dh   si    di    cflgs flags\n");  
		hexwrite ((byte *) ®s,16,global.debugfile);  
	}  
	if ((errorcode = regs.h.ah) != 0) return;  
	geometry.heads = (dword) regs.h.dh + 1;  
	geometry.sectors = (dword) regs.h.cl & 0x3f;  
	geometry.cylinders = ((dword) regs.h.ch | (((dword) regs.h.cl << 2) & 0x300)) + 1;  
  
	if (global.debug_mode)  
	{  
		fprintf (global.debugfile, "\nGeometry reported by BIOS:\n");  
		fprintf  
		(  
			global.debugfile,  
			"%ld cylinders, %ld heads, %ld sectors\n",  
			geometry.cylinders,  
			geometry.heads,  
			geometry.sectors  
		);  
	}  
}  
  
void fips_harddrive::reset (void)  
{  
	union REGS regs;  
  
	regs.h.ah = RESET_DISK;  
	regs.h.dl = number;  
	int86 (DISK_INT,®s,®s);  
	if (global.debug_mode)  
	{  
		fprintf (global.debugfile,"\nRegisters after call to int 13h 00h (drive %02Xh):\n\n",number);  
		fprintf (global.debugfile,"al ah bl bh cl ch dl dh   si    di    cflgs flags\n");  
		hexwrite ((byte *) ®s,16,global.debugfile);  
	}  
	errorcode = regs.h.ah;  
}  
  
void fips_logdrive_info::put_debug_info (void)  
{  
	fprintf (global.debugfile,"Calculated Partition Characteristica:\n\n");  
	fprintf (global.debugfile,"Start of FAT 1: %lu\n",start_fat1);  
	fprintf (global.debugfile,"Start of FAT 2: %lu\n",start_fat2);  
	fprintf (global.debugfile,"Start of Rootdirectory: %lu\n",start_rootdir);  
	fprintf (global.debugfile,"Start of Data: %lu\n",start_data);  
	fprintf (global.debugfile,"Number of Clusters: %lu\n",no_of_clusters);  
}  
  
dword fips_partition::min_cylinder (fat16 fat, drive_geometry geometry)  
{  
	dword new_part_min_sector =  
		info().start_data  
		+ (dword) 4085  
		* bpb().sectors_per_cluster;  
  
	dword new_part_min_cylinder =  
		(  
			new_part_min_sector  
			+ partition_info->start_sector_abs  
			- 1  
		)  
		/ (geometry.heads * geometry.sectors)  
		+ 1;  
  
	if (new_part_min_cylinder > partition_info->end_cylinder)  
		error ("Partition too small - can't split");  
  
	dword min_free_cluster = fat.min_free_cluster ();  
	dword min_free_sector =  
		info().start_data  
		+ (min_free_cluster - 2)  
		* (dword) bpb().sectors_per_cluster;  
  
	dword min_free_cylinder =  
		(  
			min_free_sector  
			+ partition_info->start_sector_abs  
			- 1  
		)  
		/ (geometry.heads * geometry.sectors)  
		+ 1;  
  
	if (min_free_cylinder > partition_info->end_cylinder)  
		error ("Last cylinder is not free");  
  
	if (new_part_min_cylinder < min_free_cylinder)  
		new_part_min_cylinder = min_free_cylinder;  
  
	return (new_part_min_cylinder);  
}  
  
  
boolean fips_partition::split (fips_harddrive hd)  
{  
	if (read_boot_sector ())  
		error ("Error reading boot sector");  
  
	if (global.debug_mode)  
	{  
		fprintf  
		(  
			global.debugfile,  
			"\nBoot sector drive %02Xh, partition %u:\n\n",  
			hd.number,  
			number + 1  
		);  
  
		hexwrite  
		(  
			boot_sector->data,  
			512,  
			global.debugfile  
		);  
	}  
  
	get_bpb ();  
  
	printx ("\nBoot sector:\n\n");  
	print_bpb ();  
  
	get_info ();  
	if (global.debug_mode)  
		write_info_debugfile ();  
  
	check ();  
  
	fat16 fat1 (this,1);  
	fat16 fat2 (this,2);  
  
	fat1.check_against (&fat2);  
  
	dword new_part_min_cylinder =  
		min_cylinder (fat2, hd.geometry);  
  
	if (ask_if_save()) save_root_and_boot(&hd,this);  
  
	dword new_start_cylinder =  
		ask_for_new_start_cylinder  
		(  
			partition_info->start_cylinder,  
			new_part_min_cylinder,  
			partition_info->end_cylinder,  
			hd.geometry.heads * hd.geometry.sectors  
		);  
  
	fat2.check_empty  
	(  
		new_start_cylinder  
			* hd.geometry.heads  
			* hd.geometry.sectors  
		- partition_info->start_sector_abs  
	);  
  
	hd.calculate_new_root (new_start_cylinder, this);  
  
	hd.put_partition_table();  
	hd.get_partition_table();  
  
	printx ("\nNew partition table:\n\n");  
	hd.print_partition_table ();  
  
	hd.check (FINAL_CHECK);  
  
	if (ask_if_continue () == false)  
	{  
		return (false);  
	}  
  
	calculate_new_boot ();  
  
	put_bpb ();  
	get_bpb ();  
  
	printx ("\nNew boot sector:\n\n");  
	print_bpb ();  
  
	get_info ();  
	if (global.debug_mode)  
		write_info_debugfile ();  
  
	check();  
  
	if (!global.test_mode)  
	{  
		ask_for_write_permission ();  
  
		if (hd.write_root_sector ())  
			error ("Error writing root sector");  
  
		if (write_boot_sector ())  
			error ("Error writing boot sector");  
  
		printx ("Repartitioning complete\n");  
	}  
  
	return (true);  
}